1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
#!/usr/bin/env python3
# Copyright (c) 2017-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Tests NODE_NETWORK_LIMITED.
Tests that a node configured with -prune=550 signals NODE_NETWORK_LIMITED correctly
and that it responds to getdata requests for blocks correctly:
- send a block within 288 + 2 of the tip
- disconnect peers who request blocks older than that."""
from test_framework.messages import (
CInv,
MSG_BLOCK,
NODE_NETWORK_LIMITED,
NODE_P2P_V2,
NODE_WITNESS,
msg_getdata,
)
from test_framework.p2p import P2PInterface
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_raises_rpc_error,
try_rpc
)
# Minimum blocks required to signal NODE_NETWORK_LIMITED #
NODE_NETWORK_LIMITED_MIN_BLOCKS = 288
class P2PIgnoreInv(P2PInterface):
firstAddrnServices = 0
def on_inv(self, message):
# The node will send us invs for other blocks. Ignore them.
pass
def on_addr(self, message):
self.firstAddrnServices = message.addrs[0].nServices
def wait_for_addr(self, timeout=5):
test_function = lambda: self.last_message.get("addr")
self.wait_until(test_function, timeout=timeout)
def send_getdata_for_block(self, blockhash):
getdata_request = msg_getdata()
getdata_request.inv.append(CInv(MSG_BLOCK, int(blockhash, 16)))
self.send_message(getdata_request)
class NodeNetworkLimitedTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 3
self.extra_args = [['-prune=550'], [], []]
def disconnect_all(self):
self.disconnect_nodes(0, 1)
self.disconnect_nodes(0, 2)
self.disconnect_nodes(1, 2)
def setup_network(self):
self.add_nodes(self.num_nodes, self.extra_args)
self.start_nodes()
def test_avoid_requesting_historical_blocks(self):
self.log.info("Test full node does not request blocks beyond the limited peer threshold")
pruned_node = self.nodes[0]
miner = self.nodes[1]
full_node = self.nodes[2]
# Connect and generate block to ensure IBD=false
self.connect_nodes(1, 0)
self.connect_nodes(1, 2)
self.generate(miner, 1)
# Verify peers are out of IBD
for node in self.nodes:
assert not node.getblockchaininfo()['initialblockdownload']
# Isolate full_node (the node will remain out of IBD)
full_node.setnetworkactive(False)
self.wait_until(lambda: len(full_node.getpeerinfo()) == 0)
# Mine blocks and sync the pruned node. Surpass the NETWORK_NODE_LIMITED threshold.
# Blocks deeper than the threshold are considered "historical blocks"
num_historial_blocks = 12
self.generate(miner, NODE_NETWORK_LIMITED_MIN_BLOCKS + num_historial_blocks, sync_fun=self.no_op)
self.sync_blocks([miner, pruned_node])
# Connect full_node to prune_node and check peers don't disconnect right away.
# (they will disconnect if full_node, which is chain-wise behind, request blocks
# older than NODE_NETWORK_LIMITED_MIN_BLOCKS)
start_height_full_node = full_node.getblockcount()
full_node.setnetworkactive(True)
self.connect_nodes(2, 0)
assert_equal(len(full_node.getpeerinfo()), 1)
# Wait until the full_node is headers-wise sync
best_block_hash = pruned_node.getbestblockhash()
self.wait_until(lambda: next(filter(lambda x: x['hash'] == best_block_hash, full_node.getchaintips()))['status'] == "headers-only")
# Now, since the node aims to download a window of 1024 blocks,
# ensure it requests the blocks below the threshold only (with a
# 2-block buffer). And also, ensure it does not request any
# historical block.
tip_height = pruned_node.getblockcount()
limit_buffer = 2
# Prevent races by waiting for the tip to arrive first
self.wait_until(lambda: not try_rpc(-1, "Block not found", full_node.getblock, pruned_node.getbestblockhash()))
for height in range(start_height_full_node + 1, tip_height + 1):
if height <= tip_height - (NODE_NETWORK_LIMITED_MIN_BLOCKS - limit_buffer):
assert_raises_rpc_error(-1, "Block not found on disk", full_node.getblock, pruned_node.getblockhash(height))
else:
full_node.getblock(pruned_node.getblockhash(height)) # just assert it does not throw an exception
# Lastly, ensure the full_node is not sync and verify it can get synced by
# establishing a connection with another full node capable of providing them.
assert_equal(full_node.getblockcount(), start_height_full_node)
self.connect_nodes(2, 1)
self.sync_blocks([miner, full_node])
def run_test(self):
node = self.nodes[0].add_p2p_connection(P2PIgnoreInv())
expected_services = NODE_WITNESS | NODE_NETWORK_LIMITED
if self.options.v2transport:
expected_services |= NODE_P2P_V2
self.log.info("Check that node has signalled expected services.")
assert_equal(node.nServices, expected_services)
self.log.info("Check that the localservices is as expected.")
assert_equal(int(self.nodes[0].getnetworkinfo()['localservices'], 16), expected_services)
self.log.info("Mine enough blocks to reach the NODE_NETWORK_LIMITED range.")
self.connect_nodes(0, 1)
blocks = self.generate(self.nodes[1], 292, sync_fun=lambda: self.sync_blocks([self.nodes[0], self.nodes[1]]))
self.log.info("Make sure we can max retrieve block at tip-288.")
node.send_getdata_for_block(blocks[1]) # last block in valid range
node.wait_for_block(int(blocks[1], 16), timeout=3)
self.log.info("Requesting block at height 2 (tip-289) must fail (ignored).")
node.send_getdata_for_block(blocks[0]) # first block outside of the 288+2 limit
node.wait_for_disconnect(5)
self.nodes[0].disconnect_p2ps()
# connect unsynced node 2 with pruned NODE_NETWORK_LIMITED peer
# because node 2 is in IBD and node 0 is a NODE_NETWORK_LIMITED peer, sync must not be possible
self.connect_nodes(0, 2)
try:
self.sync_blocks([self.nodes[0], self.nodes[2]], timeout=5)
except Exception:
pass
# node2 must remain at height 0
assert_equal(self.nodes[2].getblockheader(self.nodes[2].getbestblockhash())['height'], 0)
# now connect also to node 1 (non pruned)
self.connect_nodes(1, 2)
# sync must be possible
self.sync_blocks()
# disconnect all peers
self.disconnect_all()
# mine 10 blocks on node 0 (pruned node)
self.generate(self.nodes[0], 10, sync_fun=self.no_op)
# connect node1 (non pruned) with node0 (pruned) and check if the can sync
self.connect_nodes(0, 1)
# sync must be possible, node 1 is no longer in IBD and should therefore connect to node 0 (NODE_NETWORK_LIMITED)
self.sync_blocks([self.nodes[0], self.nodes[1]])
self.test_avoid_requesting_historical_blocks()
if __name__ == '__main__':
NodeNetworkLimitedTest().main()
|
